Outdoor Prefabricated Customized 35KV 20KV to 690V New Energy Power Combined Box Type Substation BESS Transformer Price
A BESS transformer (Battery Energy Storage System transformer) is a critical component that connects the battery system to the grid by stepping voltage up or down and ensuring safe, stable power flow.
35kV oil immersed power transformer
,5000kVA Dyn11 transformer
,ONAN oil immersed transformer
A BESS transformer (Battery Energy Storage System transformer) is a critical component that connects the battery system to the grid by stepping voltage up or down and ensuring safe, stable power flow. It is typically designed to handle bi-directional energy transfer, frequent load cycling, and harmonics generated by inverters.
In most projects, the BESS transformer works between the PCS (Power Conversion System) and the medium-voltage grid, with common configurations such as 0.4/13.8 kV or 0.69/33 kV. Key design considerations include thermal performance, overload capability, harmonic tolerance, and insulation reliability.
At HENTG POWER, BESS transformers are engineered for high efficiency, compact footprint, and long service life, making them ideal for renewable integration, peak shaving, and grid stabilization applications.
| Product Parameters | ||||
|---|---|---|---|---|
| Basic Technical Parameters | 2 | Insulation & Thermal Classes | ||
| Type & Model | S11-5000-33/0.69 | Insulation Level | Class A | |
| Rated Capacity | 5000kVA | a | High-Voltage Side | |
| Rated Voltage(HV / LV) | 33kv/0.69kv | Lightning Impulse Withstand(peak) | 200kv | |
| Rated Current(HV / LV) | 87.5A /4183.7 A | Short-Duration Power-Frequency Withstand(r.m.s.) | 85kv | |
| Voltage Ratio | ±2 × 2.5 % | Lightning Impulse Withstand (peak) | ||
| Short-Circuit Impedance | 7% | Short-Duration Power-Frequency Withstand (r.m.s.) | 5kv | |
| Vector Group | Dyn11 | |||
| Rated Frequency | 50Hz | |||
| Cooling Method | ONAN | |||
| Losses, Noise & No-Load Current | 4 | Other Technical Requirements | ||
| No-Load Loss | ≤ 3970W (+15%) | 4 | Overall Dimensions (L × W × H) | 2650 mm × 2900 mm × 2750 mm |
| Load Loss | ≤ 39018W (+15%) | b. | Estimated Total Mass | 10.7t |
| Sound Pressure Level | ≤ 77 dB(A) | |||
| No-Load Current | 0.50% | |||
| Feature | Advantage | Benefit |
|---|---|---|
| Integrated Design | Combines inverter,transformer,and HV distribution | Fewer devices, savesspace and installationtime |
| Modular Structure | Standardized componentsfor quick deliveryand easy O&M | Lower O&M costs,higher reliability |
| High-efficiency Inverter | >98.5% conversionefficiency | Minimizes power loss,improves energyconversion efficiency |
| Smart Monitoring System | Real-time monitoring& remote control | Efficient management and fault alerts |
| Comprehensive Protection | Over-voltageover-current short-circuit protection | Ensures safe operation for both equipment and personnel |
| All-weather Adaptability | IP54 rating,works in harsh environments | Applicable in deserts,plateaus and more |
Q1: What type of transformer is typically used in PV + BESS projects in Europe?
A: Most projects use medium-voltage step-up transformers connecting the inverter/PCS to the grid, with common ratings like 0.4/20 kV or 0.69/30 kV. Depending on the layout, you’ll see pad-mounted, compact substations, or skid-mounted solutions combining transformer + RMU.
Q2: Are there specific standards required for transformers in Europe?
A: Yes. Transformers must comply with IEC 60076 for general design and IEC 62930 (project-level integration context).
In addition, Ecodesign (EU) 548/2014 sets minimum efficiency requirements, which are mandatory for grid-connected transformers.
Q3: What are the key technical challenges for BESS transformers?
A: BESS transformers must handle:
- Bi-directional power flow (charge/discharge cycles)
- High harmonic distortion from PCS
- Frequent load fluctuations
- Increased thermal stress
This requires careful design in cooling, insulation, and harmonic mitigation.
Q4: How does HENTG POWER support PV + BESS projects in Europe?
A:At HENTG POWER, we provide:
- Transformers compliant with IEC and EU Ecodesign requirements
- Solutions adapted for BESS cycling and harmonic conditions
- Flexible options including mineral oil and natural ester insulation
- Integrated designs for compact substations and skid systems
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